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Frame A data structure that consists of fields, predetermined by a protocol, for the transmission of user data and control data.
Gateway A special purpose, dedicated computer that attaches to two or more (sub)networks and routes packets from one to the other. In particular, an Internet gateway routes IP datagrams among the networks to which it connects. Gateways route packets to other gateways until they can be delivered to the final destination directly across the physical (sub)network. (Also sometimes referred to as a router.) A gateway or router connects network nodes at the Network Layer, ISO layer 3.
Global Address Administration Address administration in which all LAN individual addresses are unique within the same or other Local Area Networks. (See also Local Address Administration.)
Global Data See Ethernet Global Data.
Group Address An IP multicast address that identifies a group of network nodes on a Local Area Network.
Host A computer or workstation that communicates with stations such as PLCs or CNCs across a network, especially one that performs supervisory or control functions. Note that this same term is widely used in TCP/IP literature to refer to any network node that can be a source or destination for network messages. (See also Hostid.)
Host Group A group IP address used to receive multicast IP messages from the network. Host Group addresses must be valid Class D (multicast) IP addresses.
Hostid The hostid is the part of the IP address identifying the host on the network. (See also Netid.)
Hub See Repeater
IEEE 802 The IEEE 802 LAN series of standards are as follows:
IEEE 802 Overview and Architecture.
IEEE 802.2 The Logical Link Control (LLC) sublayer of OSI Data Link Layer common above all IEEE 802 Medium Access Control (MAC) sublayers.
IEEE 802.3 CSMA/CD (Ethernet) MAC and Physical Layer standard.
IEEE 802.4 Token Bus (MAP LANs) MAC and Physical Layer standard.
IEEE 802.5 Token Ring (IBM) MAC and Physical Layer standard.
Information Field That part of a protocol data unit (PDU) that contains data, as opposed to the address field and command field.
Initiating Station The station from which an instance of communication (a transaction) originates. Also referred to as “client”.
Interface Shortened form for “Ethernet Interface”. The general term used in this manual to identify the GE Fanuc hardware module, with or without software, that connects a PLC (or CNC) to a network. (See also LAN Interface.)
Internet Address A unique Internet address identifies each node on an IP network (or system of connected networks). The Internet address is assigned to the node by the user. (Also known as an IP address.) (See also Physical Address.)
Internet Control Message Protocol (ICMP) The Internet standard protocol that handles error and control messages.
TCP/IP Ethernet Communications for the Series 90™ PLC User's Manual– May 2002 |
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